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This paper studies mass transfer characteristics over the surface of corrugated-sheet structured packing by Computational Fluid Dynamics (CFD) approach.It is well known that mass transfer efficiency in gas-phase plays a key role in process of gas-liquid mass transfer under the atmospheric and pressure-reducing condition.This study is based on the condition below and around atmospheric pressure and an assumption that liquid is supposed to be still and evenly distributed over the surface of corrugated-sheet structured packing.The simulation is carried out between two corrugated-sheet structured packing rotating 90° to each other as shown in Figure 1,which consists of 30 unit cells and some incomplete ones.The CFD simulation is completed with Low Reynolds κ-ε (Low-re-ke) turbulence model and wall-surface chemical reaction module.This Low-Re-ke model is proposed by C.K.G.Lam and K.Brerahorst [1],which is valid in the turbulent,semilaminar and laminar regions.The wall-surface chemical reaction module is taken to make mass transfer.Fast reaction is set to guarantee the reactive resistance to be negligible.Therefore,resistance in the whole process is only due to the mass transfer resistance.The mass transfer coefficient (k) can be obtained from Eq.(1) according to film model.